well my opti and waterpump on me, but its in the shop getting a csi electric pump thrown on along with a used vented opti, and its getting the tb coolant bypassed, how much should i be putting to the ground after this little upgrade? 300ish?

 

why put on a used opti when a new one is less that 200 and you won't have problems with it. I would say 280ish those headers and the A4 are hurting you i am sure.